巨高巷道围岩稳定及控制

doi:10.13722/j.cnki.jrme.2014.s2.063

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Abstract In order to investigate ground control of ultra-high roadway. The ultrahigh segment(section：5.25×8 m) of No. 5205 rail roadway in a mine was selected as research object，the surrounding rock response characteristic in the process of height from 3.5 m to 8 m was simulated by UDEC. Research results show that：(1) Deviatoric stress increases in shallow part and decrease in depth；Deviatoric stress maximum in sides decreases，also the maximum in roof and floor increases and transfers to the deeper；Deviatoric stress change degree：sides＞roof＞floor. (2) Surrounding rock deformation scope：sides＞roof＞floor and its maximal deformation increasing amount：roof＞sides＞floor. (3) Fracture fields are all distributed as semi-ellipse，which has fracture transfixion area，fracture area and microfracture area from the shallow to the deep. It shows that balanced arch contour become larger with roadway height increasing by analyzing balanced arch. That is the maximum un-stable width of sides，roof caving arch height and roof pressure are all increaseing. Realiszed that：(1) Anchor group effect reduces surrounding rock bulking deformation. (2) Diagonal cable could be anchoraged in the shoulder and bottom angle no fracture areas through un-stable triangle block. (3) High performance and pretension bolt support can enhance mechanical parameters such as internal friction angle，which could reduces balanced contour. Based on this，the combined support technology of high strength and high pre-stressing bolt net bar and sides diagonal cable beam is proposed. Self-stabilization period of ultra-high roadway is 10 days，roof-to-floor relative convergence is 104 mm，both sides relative convergence is 150 mm，the total roof separation is 3.5 mm.

Key words： rock mechanics ultra-high roadway deviatoric stress fracture balanced arch support

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	Articles by authors
	XU Lei1
	WU Huankai2
	LI Bo3
	XIAO Tongqiang4

Cite this article:

XU Lei1,WU Huankai2,LI Bo3, et al. STABILITY AND CONTROL OF SURROUNDING ROCK IN ULTRA-HIGH ROADWAY[J]. , 2014, 33(S2): 3891-3902.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.063 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/3891

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